A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5835-01-377-8972
NSN 7035-00-337-8745
NSN 6220-01-410-7555
NSN 5920-01-580-0777
NSN 6150-00-678-0075
NSN 6620-01-105-5770
NSN 6620-01-280-3516
NSN 5855-01-143-7051
NSN 5990-01-277-2118
NSN 5996-01-006-6346
NSN 6685-00-144-6362
NSN 5950-00-958-1637